Which appears to be the name given historically, 100 years ago or so, in my local area for in-ground rainwater harvesting tanks.
And to add to that, I've just come across an exchange from the UK Parliament in 1935 (when piped RWS was just beginning to be scaled up as beginning to be deemed affordable - GDP per capita having reached $9,000 (2020 prices):
Hansard, July 1934 PARLIAMENTARY SECRETARY to the MINISTRY of HEALTH (Mr. Shakespeare): The second problem of the drought concerns rural areas. This is a permanent problem which the drought has intensified. It is perfectly true that there are isolated farmhouses or groups which have never had a water supply, and may be, never will have a water supply, or, at any rate, they will never have a piped supply.
They will rely on the surface wells, or they must rely upon tank supplies. He made the point that the local authorities of rural areas did not attach enough importance to the collection of rain water. Consider a cottage with a roof surface of 500 square feet. A rainfall of 30 inches during the year would provide 7,800 gallons of water for the occupants of that household [100 litres per day], in what I am assuming is an ordinary cottage in a rural area.
The cost of a thousand-gallon tank [4.5m3] is somewhere in the neighbourhood of £20 or £25 [$1,800-$2,300 USD$ PPP 2020 prices]. In the large majority of cases, the utilisation of a tank, whether it is of corrugated iron or is underground, is probably the best way to ensure a constant supply of water.
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